Structs vs. Classes

// A plain vanilla C class (valid C++)

struct employee {

char *name;

int base_pay;

int year_started;

int leave_time;

};

// Declare an instance of an employee

struct employee e;

// Note the structure is a totally

// passive container for data

e.name = strdup(“John Doe”);

e.base_pay = 40000;

e.year_started = 1993;

e.leave_time = 50;

printf(“Name is: %s\n”, e.name);

printf(“Base pay is: %d\n”, e.base_pay);

printf(“%d days of leave since %d\n”,

e.leave_time, e.year_started);

class employee {

public: // ignore this for now

// First declare the actual storage

char *name_p;

int base_pay_p;

int year_started_p;

int leave_time_p;

// Now declare functions to access that storage;

// these are sometimes called “accessor functions”.

// Also: strdup is just a malloc/strcpy shortcut

void set_name(char *name) {name_p = strdup(name);}

char *name() { return name_p; }

void set_base_pay(int pay) { base_pay_p = pay; }

int base_pay() { return base_pay_p; }

};

employee e; // Instance of the employee class

e.set_name(“John Doe”);

e.set_base_pay(40000);

printf(“Name is %s; base pay is %d\n”, e.name(),

e.base_pay());

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